It looks a bug, I have reported it to Sencha.
http://www.sencha.com/forum/showthread.php?227137

Lets wait what they will answer.

Daniil

Jun 28, 2012, 11:24 AM

Sencha has opened a bug ticket. I will monitor.

Do you need a workaround for now? We are unable to find yet.

Timothy

Jun 28, 2012, 12:17 PM

Sencha has opened a bug ticket. I will monitor.

Do you need a workaround for now? We are unable to find yet.

Hello Daniil,

It looks like it's more than just the scroll bar, I don't think the actual column and rows are laying out either. I've bound some data to the grid and it's not showing. I'm going to try wrapping the GridPanel in an additional Panel within the Accordion to see if that works this morning.